You can use this
private void button1_MouseEnter(object sender, EventArgs e)
{
Button sender1 = (Button)sender;
sender1.Height += 30;
sender1.Width += 30;
sender1.Top -= 15;
sender1.Left -= 15;
}
private void button1_MouseLeave(object sender, EventArgs e)
{
Button sender1 = (Button)sender;
sender1.Height -= 30;
sender1.Width -= 30;
sender1.Top += 15;
sender1.Left += 15;
}